Marshall Headphones has announced the Stanmore ($400), a new Bluetooth speaker. Modeled after a vintage Marshall amp, the Stanmore also has analog knobs for control. The Stanmore puts out 80 watts of total output from a 5 1/4” woofer and two 3/4” tweeters. Optical output is also included with the Stanmore, so devices including the Apple TV can be connected to the speaker. A 3.5mm input and RCA input are on board, as well. Marshall’s…